5 axis BoB spindle control help needed

[Noddy]

Well, I'm kind of getting there. I can control the speed from the board now, but I can't turn the spindle on/off. If I change the VFD settings to start the spindle from the front panel, it works.

There are three possible settings for the spindle on/off control;

0 = front panel control
1 = analogue terminal control (which it should be to control via Mach3 from the info I have)
2 = communication control

I've tried all three with no luck with switching the spindle on/off in Mach3, this kind of defeats the object of the exercise if I can only control the speed.

I have checked continuity of the cable, which is fine. I can hear the relay on the BoB operating, and the relay LED lights up on the board when it's energised. I have 24v and USB 5V supply to the board, and have checked both Voltages (24.06V and 4.94V), which are fine. The spindle speed pins are putting out 0 - 9.6V depending upon the speed setting, and the speed of the spindle rises and falls in line with the voltage/speed setting within Mach3 as expected.

Can't think of sod all else - any ideas??

Edited to add; my machine came with a four pin plug on the VFD, but only three core cable was used from the control box to the spindle. I changed this to four core to add the earth wire, and soldered a wire from the earth pin in the spindle and earthed it. I also added an earth wire from the earth pin on the VFD to the earth pin on the back of the spindle socket on the control board.